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One of the constituents of the pancreatic juice while poured into the duodenum in humans is
A
Trypsin
B
Enterokinase
C
Trypsinogen
D
Chymotrypsin
Detailed Solution
The pancreatic juice contains inactive enzymes (zymogens): trypsinogen, chymotrypsinogen and procarboxypeptidases, along with amylases, lipases and nucleases.
So what is actually poured into the duodenum is trypsinogen, not trypsin.
Trypsinogen is activated to trypsin in the intestine by enterokinase, an enzyme secreted by the intestinal mucosa (it is a constituent of intestinal juice, not pancreatic juice).
Trypsin in turn activates chymotrypsinogen to chymotrypsin, so chymotrypsin is also formed only inside the intestine.
Hence the constituent of pancreatic juice poured into the duodenum is trypsinogen.
So what is actually poured into the duodenum is trypsinogen, not trypsin.
Trypsinogen is activated to trypsin in the intestine by enterokinase, an enzyme secreted by the intestinal mucosa (it is a constituent of intestinal juice, not pancreatic juice).
Trypsin in turn activates chymotrypsinogen to chymotrypsin, so chymotrypsin is also formed only inside the intestine.
Hence the constituent of pancreatic juice poured into the duodenum is trypsinogen.